#define _CRT_SECURE_NO_WARNINGS 1
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'

void solve() {
    int n; cin >> n;
    string s; cin >> s;
    int f = 0;
    for (int i = 0; i < n; i++) {
        if (s[i] == '0') {
            f = 1; break;
        }
    }
    if (f) cout << "YES" << endl;
    else cout << "NO" << endl;
}

int main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int t; cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}
